*{
    margin: 0;
    padding: 0;
}
body,html{
    width:100%;
    height: 100%;
    margin:0;
}
body{
    display: flex;
    background-color: #f5f5f5;
    flex-direction: column;
    font-family: "微软雅黑";
}
li{
    list-style: none;
    user-select: none;
}
a{
    cursor: pointer;
    text-decoration: none;
}
